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PCI/MSI: Support allocating virtual MSI interrupts

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For NTB devices, we want to be able to trigger MSI interrupts
through a memory window. In these cases we may want to use
more interrupts than the NTB PCI device has available in its MSI-X
table.

We allow for this by creating a new 'virtual' interrupt. These
interrupts are allocated as usual but are not programmed into the
MSI-X table (as there may not be space for them).

The MSI address and data will then handled through an NTB MSI library
introduced later in this series.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe
2019-05-23 16:30:51 -06:00
committed by Jon Mason
parent a944ccc3b0
commit d7cc609fb6
3 changed files with 62 additions and 9 deletions
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9
include/linux/pci.h
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@@ -1362,6 +1362,15 @@ int pci_set_vga_state(struct pci_dev *pdev, bool decode,
#define PCI_IRQ_MSI (1 << 1) /* Allow MSI interrupts */
#define PCI_IRQ_MSIX (1 << 2) /* Allow MSI-X interrupts */
#define PCI_IRQ_AFFINITY (1 << 3) /* Auto-assign affinity */
/*
* Virtual interrupts allow for more interrupts to be allocated
* than the device has interrupts for. These are not programmed
* into the device's MSI-X table and must be handled by some
* other driver means.
*/
#define PCI_IRQ_VIRTUAL (1 << 4)
#define PCI_IRQ_ALL_TYPES \
(PCI_IRQ_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX)